Robert B. Knowles, M.D.
Internal Medicine Physician · Sparta, TN
Robert B. Knowles, M.D. is an internal medicine physician with a practice address in Sparta, Tennessee, and NPI 1548251341, issued on Oct 31, 2005. Check the license (Tennessee MD28675, as entered in NPPES) on the Tennessee Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Robert B. Knowles
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD28675 TN
Self-reported in NPPES; status is on the state search - Practice location
- 435 Sewell Dr, Sparta, TN 38583
- Phone
- (931) 738-4595
- Enumerated
- Oct 31, 2005
- Record last updated
- Dec 17, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (931) 837-4596
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,596 in Tennessee → Look up another NPI →
Also registered at 435 Sewell Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sharon HamptonFamily Medicine Physician1720540768
- Ryan Hunley, DOFamily Medicine Physician1992233704
Verify Robert B. Knowles in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTennessee Board of Medical Examiners
Search for license MD28675Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,626 Medicare Part D claims for 179 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 93 claims were for opioids.
Most prescribed
- Lisinopril104 claims
- Amlodipine Besylate85 claims
- Omeprazole84 claims
- Levothyroxine Sodium78 claims
- Losartan Potassium74 claims
- Gabapentin72 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Robert B. Knowles among 2,596 internal medicine physician records in Tennessee
Robert B. Knowles, M.D. is one of 2,596 internal medicine physician records with a practice address in Tennessee. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2014 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Tennessee practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 internal medicine physician records list a practice address in Sparta
They are 6 of the 189 NPPES records with a practice address in Sparta, and 2,596 internal medicine physician records in Tennessee.
All 2,596 in Tennessee → Every provider in Sparta → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeffry Belknap, M.D.Sparta, TN 385831407920127
- Joann Data, MD,PHDSparta, TN 385831659609808
- Mollie Dodson, MDSparta, TN 385831760486112
- Abhay Kemkar, MDSparta, TN 385831346312477
- Geneth Wolfer, D.O.Sparta, TN 385831053462168
- Robert Sapp, MDSpencer, TN 385851982705836
- John Edgington, DORickman, TN 385801457048019
- Mark Sherfey, MDMonterey, TN 385741497877583
Common questions
What is Robert B. Knowles, M.D.'s NPI number?
Robert B. Knowles, M.D.'s National Provider Identifier (NPI) is 1548251341, issued on Oct 31, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert B. Knowles, M.D. located?
The NPPES record lists a practice address at 435 Sewell Dr, Sparta, TN, 38583. Phone: (931) 738-4595. Providers update this record themselves, so call before visiting.
How can I verify Robert B. Knowles, M.D.'s license?
NPPES lists Tennessee license number MD28675, as entered by the provider. Search the Tennessee Board of Medical Examiners at https://www.tn.gov/health/licensure/me.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert B. Knowles, M.D. prescribe under Medicare Part D?
In 2024, Robert B. Knowles, M.D. had 2,626 Medicare Part D claims for 179 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.